Objective：The aim of this study is to investigate the clinical features of different subtypes, treatment and curative effect of fungal ball maxillary sinusitis (FBMS). Methods: The symptoms, signs, imaging characteristics, treatment methods and postoperative follow-up of 49 patients with fungal bulbous maxillary sinusitis admitted to our department from January 2019 to June 2020 were retrospectively analyzed, and their different clinical characteristics and treatment characteristics were summarized and analyzed. Result: In this retrospective study, all the 49 patients were definitely diagnosed as FBMS. According to the clinical features, it can be divided into 4 different clinical characteristics, respectively as follows: ① Subtype1 simple FBMS: there were 21 patients in this subtype, The main clinical symptoms were headache, pus, runny blood and nasal obstruction on the affected side. Maxillary sinus was opened and sinus orifice was enlarged appropriately during the operation, and nasal irrigation was given after the operation. ②Subtype2 asymptomatic FBMS: there were 15 patients in this subtype, this type is mainly physical examination or other disease examination unintentionally found, sinus imaging characteristics have typical characteristics of fungal sinusitis; The maxillary sinus was opened intraoperatively and the sinus orifice was appropriately enlarged. ③ Subtype3 FBMS with nose polyp: there were 8 patients in this subtype ,main clinical symptom is suffer from the symptom such as side nose plug, pus nose, have a headache, giddy. Surgery was performed to remove the nasal polyp, open the maxillary sinus and expand the sinus orifice appropriately. ④ Subtype 4 FBMS with allergic rhinitis (AR): there were 5 patients in this subtype, the main clinical symptoms is suffering from side nasal blood, nasal congestion with sneezing, clear nose, nose itching and other allergic rhinitis symptoms. Intraoperatively, the mucosa of the sinus cavity was edematous and polypoid. The maxillary sinus was opened and the antrum was enlarged. When the lesion is located in maxillary sinus, bottom wall, inside line under 0 °endoscope and improved tear before surgery fossae. Conclusion: Classification according to different clinical characteristics of fungal bulbous maxillary sinusitis is conducive to accurate treatment. Different surgical approaches under nasal endoscope can reduce postoperative recurrence and improve prognosis; When patients with allergic rhinitis need medication..